Life in the Cambrian & Ordovician ~542-444 mya | GEO GIRL
19:06
Geology of the Cambrian & Ordovician 542 - 444 Mya | GEO GIRL
19:23
Life Before Mammals in the Late Paleozoic Era (When Animals Moved to Land!) | GEO GIRL
21:53
When Diversity of Life on Earth Tripled! GEO GIRL
29:02
Cambrian Explosion- More like PREcambrian Explosion & Cambrian Skeletonization | GEO GIRL
26:49
How Bad Was The Great Oxidation Event?
13:16
Carboniferous Climate & the Ice Age & Giant Insects that Resulted | GEO GIRL
16:12
The Complete History of the Earth: Cambrian Period
26:17